题解 | #二叉树的镜像#
二叉树的镜像
http://www.nowcoder.com/practice/a9d0ecbacef9410ca97463e4a5c83be7
import java.util.*;
/*
* public class TreeNode {
* int val = 0;
* TreeNode left = null;
* TreeNode right = null;
* public TreeNode(int val) {
* this.val = val;
* }
* }
*/
public class Solution {
/**
* 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可
*
*
* @param pRoot TreeNode类
* @return TreeNode类
*/
public TreeNode Mirror (TreeNode pRoot) {
// write code here
if(pRoot == null) {
return null;
}
swap(pRoot);
Mirror(pRoot.left);
Mirror(pRoot.right);
return pRoot;
}
private void swap(TreeNode root) {
TreeNode tmp = root.left;
root.left = root.right;
root.right = tmp;
}
}